I have upspiral bits that I use for my box joint jig and for general purpose work. They pull the waste out of the cut. I do not have any down spiral bits which are supposed to be the best when cutting grooves in the top veneer of plywood. The downward shearing action leaves a clean cut, where the upward shearing action of an upspiral bit would cause a little fuzzing.
If I could only have one type in my shop, it would be upspiral.
***Come to think about it--- I do have 1 downspiral--- the inlay kit I have uses a downspiral bit, with very nice cuts*****
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